The phenotypic trait that selection acts upon directly is referred to as the ________ of selection
Fill in the blank(s) with correct word
target
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A type of programmed cell death associated with DNA fragmentation and caspases is known as ________.
Fill in the blank(s) with the appropriate word(s).Fill in the blank(s) with the appropriate word(s).
How many chromosomes does a human germ cell contain during metaphase I and telophase II, respectively?
A. There are 23 chromosomes during metaphase I and 46 chromosomes during telophase II B. There are 46 chromosomes during metaphase I and 46 chromosomes during telophase II C. There are 23 chromosomes during metaphase I and 23 chromosomes during telophase II D. There are 46 chromosomes during metaphase I and 23 chromosomes during telophase II
Which of the structures in Figure 50-3 is responsible for the production of hormones?
a. 1
b. 3
c. 4
d. 6
e. 7
The human b-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. Which type of selection is occurring with the b-globin gene?
A. directional B. disruptive C. stabilizing D. negative frequency dependent E. balanced